JP2852379B2 - Offset plate and method of manufacturing offset plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to gravure printing in the field of gravure printing, which has the same printing durability as a relief printing plate and the same amount of ink transfer as a gravure printing plate, and requires a high degree of shading. The present invention relates to an offset plate capable of performing offset printing and a method of manufacturing the offset plate.

[0002]

2. Description of the Related Art Conventional offset plate making involves printing a negative or positive plate information on a PS plate formed by coating a photosensitive resin film on a grained aluminum plate in a dark room, and then developing the plate. It is. In conventional printing using an offset plate, ink is applied after immersion in water, and the immersion water adhering to the resist film repels the ink so as not to adhere to the resist film. Attaches to exposed parts of board.

[0003]

However, according to the above-mentioned conventional offset plate (PS plate), printing of about 200,000 sheets is limited, and printing of 400,000, 500,000 sheets is the same. There was a problem that two or three offset plates had to be made and exchanged and mounted on a printing press. In addition, the conventional offset plate (PS plate) has a uniform and small thickness of the transferred ink regardless of the size of the pixel, and therefore has a low density smoothness. In the field, gravure printing could not be replaced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points. The present invention has the same printing durability as a relief printing plate, has an ink transfer amount comparable to that of a gravure printing plate, and has a high density smoothness. It is an object of the present invention to provide an offset plate and a method of manufacturing an offset plate capable of performing printing in place of gravure printing in the field of gravure printing that requires lithography.

[0005]

Means for Solving the Problems] The present first invention, the surface of the copper plate material, together with an amorphous plated coating having negatives edition information is formed, ports other than the plating film diethylene
It is an object of the present invention to provide an offset plate characterized in that a portion having poor plate information is etched to form a cell for storing ink.

[0006] The second invention of the present application is to apply a photosensitive film on the surface of a copper plate material, print and develop the plate information to form positive resist plate information, and perform nickel-diameter alloy plating to form a negative plate information. After forming an amorphous plating film with a coating, the resist plate information is peeled off, and the plating is performed with a corrosive liquid that is not corrosive to nickel-diameter alloy plating but corrosive to copper. An object of the present invention is to provide a method of manufacturing an offset plate, characterized in that a portion having positive plate information other than a coating is etched to form a cell for storing ink.

The third invention of the present application is to apply a copper ribbon overlapped on the double-sided pressure-sensitive adhesive tape to a roll-making material via a double-sided pressure-sensitive adhesive tape, then perform ballad copper plating, and then apply and form a photosensitive film, Next, the plate information is baked and developed to form a positive resist plate information, and then a nickel-diameter alloy plating is performed to form an amorphous plating film having a negative plate information. A cell that, after peeling, is corroded by a corrosive solution that is not corrosive to nickel-diameter alloy plating and corrosive to copper, and the portion that has the active plate information other than the plating film is etched and ink is collected. Forming a thin plate by peeling ballad copper plating from a roll from the copper ribbon. A.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, an offset plate according to the present invention has an amorphous, hydrophilic nickel-based copper plate material 1 on the surface of a roll-shaped or thin plate-shaped copper plate material 1 having ink absorbing properties. The coating 2 of the alloy plating is formed so as to have a thickness of 1 to several microns and to have negative plate information, so that the exposed copper surface 3a has positive plate information. The reason why the plate material is a copper plate material is that the material is limited to a material that can easily form an amorphous nickel-based alloy plating. The reason why the thickness of the plating may be 1 μm to several μm is that it is an offset plate, and a thickness equivalent to that of a conventional PS plate film is sufficient. Further, in the present invention, the nickel-based alloy plating which is amorphous and hydrophilic includes nickel in a large amount as a metal element and 1% to 15% by weight (preferably 10% by weight) of phosphorus or boron as a small metal element. Metal alloy plating. The film 2, which is amorphous and hydrophilic, has a property of repelling oil-based ink when water adheres thereto. The offset plate according to the present invention comprises an amorphous plating film 2 having negative plate information on a surface of a copper plate material having an ink absorbing property.
Is formed, and the plating film 2 has hydrophilicity.
When immersion water is applied during offset printing, water adheres to the plating film 2 and the oil-based ink is repelled by water so as not to adhere to the plating film 2 and adheres only to the exposed copper exposed surface 3a.

Therefore, in order to manufacture this offset plate, as shown in FIG. 2A, a photosensitive film 5 is applied to the surface of a roll-shaped or thin plate-shaped copper plate material 1, and then the photosensitive film 4 is formed. Method by overlaying a poly film 6 on the surface and printing it with a UV light source 7 (or printing low-output laser plotter so that the beam partially overlaps and blinks one after another so as to shift one after another, and prints plate information)
By printing the plate information and developing it,
As shown in FIG. 2 (b), the exposed surface 3a of the copper plate material 1 is formed so as to be negative and the resist film 7 to have positive plate information. Then, a nickel-phosphorous plating solution or a nickel-boron plating solution ( Specifically, a plating solution obtained by mixing phosphoric acid, phosphorous acid, or hypophosphorous acid, or dimethylaminoborane, or sodium borohydride in a nickel sulfate solution, a nickel sulfamate solution, or a nickel chloride solution) And electroplating or electroless plating, as shown in FIG.
On the exposed surface 3a of the copper plate material 1, a coating 2 having negative plate information made of nickel-phosphorus plating or nickel-boron plating is formed so as to have a thickness of 1 micron to several microns, and then a resist coating with a solvent. To obtain a copper exposed surface 3b of a positive plate information as shown in FIG. 2 (d). Then, the copper exposed surface 3b is not corrosive to the nickel-diameter alloy plating film 2 and etchant Podjichibu other than plating film corroded with (specifically to an aqueous solution of ferric chloride or cupric chloride is) and corrosive Te
The portion having the proper plate information is etched to form a cell for storing the ink, whereby the offset plate can be manufactured.

In particular, for the production of a thin plate-shaped offset plate wound around a drum such as a PS plate, it is preferable to remove the ballad copper plating neatly without tearing. That is, as shown in FIG. 3 (a), a double-sided adhesive tape 9 is applied to a plate roll (or a chrome-plated plate roll) R which has been subjected to a surface treatment in which the copper surface is mirror-polished and then the plating is easily peeled off. After bonding the overlapped copper ribbon 10 to the double-sided adhesive tape 9, the ballad copper plating 1 is formed so as to have a film thickness of 20 to 50 microns, and then the ballad copper plating 1 is formed on the ballad copper plating 1. FIG.
As shown in (a), a photosensitive film is applied and formed, and after printing plate information on the photosensitive film 5 applied and formed on a copper plate material,
By developing, as shown in FIG. 2 (b), the exposed surface 3a of the copper plate material is formed so as to be negative and the resist film 8 to have the plate information of the port, and then nickel-nickel plating or nickel-boron plating. Then, the composite plating is performed by dipping in a plating solution capable of performing the above-mentioned process, and the nickel plating is applied to the surface of the ballad copper plating 1 as shown in FIG.
A coating 2 of negative plate information made of phosphor plating or nickel-boron plating is formed, and then, the resist plate information is peeled off, and the surface of the plate material 1 to which ink adheres as shown in FIG. Then, the offset plate is exposed to the surface, and is then corroded by a corrosive solution that is not corrosive to nickel-diameter alloy plating but corrosive to copper, and as shown in FIG. The portion having the positive plate information is etched to form a cell 4 for storing ink, and a ballad copper plating 1 is formed along one side edge of the copper ribbon 10 as shown in FIG. And the ballad copper plating 1 is wound up from the copper ribbon 10 and peeled from the roll R to obtain a thin plate-shaped offset plate.

[0011]

According to the offset plate of the present invention, an amorphous plating film having negative plate information having hydrophilicity is formed on the surface of a copper plate material, so that the printing durability is an amorphous plating film. , The printing durability is remarkably higher than the printing durability of the PS plate, and a strength close to that of the relief printing plate can be obtained.
Accordingly, it is possible to print the number of sheets of 400,000 or 500,000 with one offset plate, and it is no longer necessary to replace the same offset plate with a printing machine every about 200,000 sheets as in the related art. . Since the offset plate of the present invention is formed with an amorphous plating film having negative plate information on the surface of the copper plate material, a strength close to the printing durability of the relief plate is obtained,
Offset printing press with conventional blanket roll,
That is, this offset plate can be used in an offset printing machine that transfers the ink of the plate roll to a blanket roll and further transfers the ink attached to the blanket roll to a web to be printed passed between the blanket roll and the printing pressure roll. The offset printing press was remodeled, the blanket roll was removed, and a roll-shaped offset plate was attached (for a thin plate offset plate, a drum was attached). It is possible to adopt a direct printing system in which the ink of the plate roll is transferred to the printing web passed between the printing media. In the offset plate of the present invention, cells are formed so as to have positive plate information, ink can be stored in the cells, and the depth of the cells is increased as a result of the etching. In the field of gravure printing, which requires a large amount and requires a high contrast density, offset printing can be performed instead of gravure printing. The offset printing plate of the present invention can obtain a strength close to the printing durability of a relief printing plate and can store ink in a cell, and thus can be used as a gravure printing plate when manufactured to have a mesh screen line. According to the method of manufacturing an offset printing plate of the present invention, a photosensitive film can be formed by applying a photosensitive film to a copper plate material, baking and developing, plating a nickel-based alloy having hydrophilicity, and stripping the resist. Plate making is possible. According to the method of manufacturing an offset plate of the present invention,
An offset plate having the same printing durability as a relief plate and capable of storing ink in cells can be manufactured. In particular, a method of manufacturing an offset plate by a method of peeling ballad copper plating is extremely useful in forming a thin plate-shaped offset plate.

[Brief description of the drawings]

FIG. 1 is a sectional view of an offset plate according to the first invention of the present application.

FIG. 2 is a sectional view showing steps of a method for manufacturing an offset plate according to the second invention of the present application.

FIG. 3 is a sectional view showing steps of a method for manufacturing an offset plate according to the third invention of the present application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Copper plate material, ballad copper plating 2 ... Coating 3a ... Copper exposed surface 3b ... Copper exposed surface 4 ... Cell 5 ... Photosensitive film R ... Plate roll 8 ...・ Resist 9 ・ ・ ・ Double-sided adhesive tape 10 ・ ・ ・ Copper ribbon

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ identification code FI // C25D 3/12 C25D 3/12 (58) Field surveyed (Int.Cl. ⁶ , DB name) B41C 1/00-1 / 18 B41N 1/00-3/08 C25D 3/12 C25D 5/02 C25D 7/00 G03F 7/00

Claims (3)

(57) [Claims] An amorphous plating film having negative plate information is formed on a surface of a copper plate material.
An offset plate, characterized in that portions having active plate information other than the plating film are etched to form cells for storing ink. 2. A photosensitive film is applied and formed on the surface of a copper plate material,
Baking and developing the plate information to form a positive resist plate information, performing nickel-diameter alloy plating to form an amorphous plating film with negative plate information, and then peeling off the resist plate information Therefore, a portion having a positive plate information other than the plating film is etched by a corrosive solution that is not corrosive to nickel-diameter alloy plating and corrosive to copper to form cells for storing ink. A method for producing an offset plate, characterized in that: 3. A double-sided pressure-sensitive adhesive tape is adhered to a roll plate-making material via a double-sided pressure-sensitive adhesive tape, then ballad copper-plated, and then a photosensitive film is applied and formed. Baking and developing to form a positive resist plate information, then performing nickel diameter alloy plating to form an amorphous plating film with negative plate information, and then peeling off the resist plate information , port other than corrosion to plated coating in etchant corrosive to copper no corrosive to nickel径合gilding
(5) A portion having active plate information is etched to form a cell for storing ink, and then ballad copper plating is peeled off from the roll from the copper ribbon to form a thin plate. Production method.